I have the stuff, but I never thought to check the expire date. Apparently it does expire. My date is three months hence, so I ordered some more.

Maybe ER-Doc can tell us how accurate/critical those dates are...?

As long as it's still sealed, they should be good for several years past their date. The issue with KI (or KIO3 or lots of other drugs) is that the binder will get so dried out they don't dissolve well, or moisture will cause the K and I to disassociate and bind to other things, making them not bioavailable.

Unfortunately, blister-packs are not great for sealing...glass bottles are better. Depends on which version you got.

Do I treat Glocks like I treat my lawn mowers? No, I treat them worse. I treat my defensive weapons like my fire extinguishers and smoke detector - annual maintenance and I expect them to work when needed